Images related to Thick Sediment in Madagascar’s Onibe River

Madagascar’s Muddy Rivers
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Madagascar’s Muddy Rivers

Gullies in the highlands called lavakas are a major source of sediment.

Published Feb 10, 2018

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Flooding near the Betsiboka River, Madagascar
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Flooding near the Betsiboka River, Madagascar

Acquired March 23, 2010, this natural-color image shows an agricultural area immediately south of the Betsiboka River, roughly 40 kilometers from the coast. The beige-and-green area filling most of the image is flooded.

Published Mar 26, 2010

Image of the Day Land Floods Human Presence

Betsiboka Estuary, Madagascar
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Betsiboka Estuary, Madagascar

The Betsiboka Estuary on the northwest coast of Madagascar is the mouth of Madagascar’s largest river and one of the world’s fast-changing coastlines. Nearly a century of extensive logging of Madagascar’s rainforests and coastal mangroves has resulted in nearly complete clearing of the land and fantastic rates of erosion. After every heavy rain, the bright red soils are washed from the hillsides into the streams and rivers to the coast. Astronauts describe their view of Madagascar as “bleeding into the ocean.” One impact of the extensive 20th century erosion is the filling and clogging of coastal waterways with sediment—a process that is well illustrated in the Betsiboka estuary. In fact, ocean-going ships were once able to travel up the Betsiboka estuary, but must now berth at the coast.

Published Apr 12, 2004

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Flooding in Madagascar
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Flooding in Madagascar

Published Mar 19, 2004

Floods

A Close-Up View of the Betsiboka
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A Close-Up View of the Betsiboka

The braided river carries iron-rich sediment from the high central plateau and mountains down through complex, woven channels and vegetated islands.

Published Nov 4, 2018

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Bombetoka Bay, Madagascar
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Bombetoka Bay, Madagascar

Published Feb 13, 2005

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Betsiboka River Floods, Madagascar—January 2009
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Betsiboka River Floods, Madagascar—January 2009

Two storms—Tropical Storm Eric and Cyclone Fanele—swept across eastern Madagascar within days of each other in January 2009. Rain from the storms swelled the Betsiboka River with floodwater.

Published Mar 30, 2009

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Tsiribihina River, Madagascar
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Tsiribihina River, Madagascar

Muddy river flow builds up the delta and the coastline on the island’s west coast.

Published May 4, 2015

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Sediment Plumes in the Hudson River
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Sediment Plumes in the Hudson River

These images from September 12, 2011, and September 2, 2010, compare conditions in the Hudson River near Ellis Island. In the wake of storms, sediment filled the river in 2011.

Published Sep 13, 2011

Land Water Severe Storms Human Presence

The Big Muddy, Western Edition
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The Big Muddy, Western Edition

Flowing past the city of Vancouver, the Fraser River delivers a thick plume of sediment to the Strait of Georgia.

Published Mar 14, 2012

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Flood Waters Overwhelm Northern Madagascar
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Flood Waters Overwhelm Northern Madagascar

Parts of the island nation saw double the usual amount of monthly rainfall.

Published Jan 30, 2020

Image of the Day Land Water Floods Human Presence Landslides

Tropical Cyclone Jokwe
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Tropical Cyclone Jokwe

Published Mar 11, 2008

Severe Storms

Flooding along the De Grey River
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Flooding along the De Grey River

Tropical Cyclone Rusty left flood conditions along the coast of northwestern Australia in early March 2013.

Published Mar 5, 2013

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Tropical Cyclone Gamede
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Tropical Cyclone Gamede

Published Feb 27, 2007

Severe Storms